<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script>
			// // var a = 10;
			// alert(a);
			// a = "abd";
			// alert(a);.
			document.write(123 + '<br>');
			document.write(1.23 + '<br>');
			document.write(NaN + '<br>');
		
			document.write('abc'+'<br>');
			document.write("aaa"+'<br>');
			
			document.write(null+'<br>');
		</script>
	</head>
	<body>
	</body>
</html>
